Update good-first-bugs auto-claiming process

[jbpaul17]

As ​discussed in this week's devchat, there is a desire to update the claiming process for good-first-bugs to change from when a ticket is assigned to when it is patched. So this request would set the owner field when has-patch is applied.

[dd32]

@jbpaul17 Is this still something that is wanted by the Core team, do you know?

This hasn't been implemented due to trac limitations, namely that AFAIK the has-patch keyword isn't added automatically and the trac workflow for core can only really do it based on capabilities.

What we could do, if is still wanted, is allow all users to self-assign tickets (ALL tickets, even if not flagged as good-first-bug, not adding a patch, etc, although the UI could be hidden via JS and only show the option when all the conditions are met..)

something like 3459.diff​, which would prevent people taking ownership of other tickets, but anyone could claim a ticket without the JS I mentioned above.

[JeffPaul]

@dd32 I think this would still be a worthwhile addition, but I'll get it added to a devchat agenda in the new year and confirm more clearly. Thanks for the effort on this, its greatly appreciated, have a safe end of the year and a happy new year!